U.S. patent application number 11/033621 was filed with the patent office on 2006-01-12 for low-abrasion rotating structure.
This patent application is currently assigned to Delta Electronics, Inc.. Invention is credited to Lee-Long Chen, Chien-Hsiung Huang, Wen-Shi Huang.
Application Number | 20060006752 11/033621 |
Document ID | / |
Family ID | 35530216 |
Filed Date | 2006-01-12 |
United States Patent
Application |
20060006752 |
Kind Code |
A1 |
Chen; Lee-Long ; et
al. |
January 12, 2006 |
Low-abrasion rotating structure
Abstract
A low-abrasion rotating structure includes a stator set, a rotor
set, and a rotating shaft. A stator hole is defined at a center of
the stator set. A rotor hole is defined at a center of the rotor
set. The rotating shaft is disposed in both the stator hole and the
rotor hole to connect the stator set and the rotor set, and is
rotatable in respect to the stator set and the rotor set.
Inventors: |
Chen; Lee-Long; (Taoyuan
Hsien, TW) ; Huang; Chien-Hsiung; (Taoyuan Hsien,
TW) ; Huang; Wen-Shi; (Taoyuan Hsien, TW) |
Correspondence
Address: |
BIRCH STEWART KOLASCH & BIRCH
PO BOX 747
FALLS CHURCH
VA
22040-0747
US
|
Assignee: |
Delta Electronics, Inc.
|
Family ID: |
35530216 |
Appl. No.: |
11/033621 |
Filed: |
January 13, 2005 |
Current U.S.
Class: |
310/90 ; 310/51;
310/67R; 310/91 |
Current CPC
Class: |
H02K 5/1675 20130101;
H02K 7/09 20130101; H02K 7/085 20130101 |
Class at
Publication: |
310/090 ;
310/091; 310/051; 310/067.00R |
International
Class: |
H02K 5/24 20060101
H02K005/24; H02K 5/16 20060101 H02K005/16 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 9, 2004 |
TW |
93120592 |
Claims
1. A low-abrasion rotating structure comprising: a rotor set
comprising a rotor hole; a stator set comprising a stator hole; and
a rotating shaft rotatably disposed in the rotor hole and stator
hole such that the rotor set is rotatable relative to the stator
set.
2. The low-abrasion rotating structure as claimed in claim 1,
wherein the rotor set comprises: a rotor seat comprising a concave
portion; and a rotor sleeve disposed in the concave portion of the
rotor seat in a close fit manner, wherein the rotor hole is formed
at a center of the rotor sleeve.
3. The low-abrasion rotating structure as claimed in claim 1,
wherein the stator set comprises: a stator seat comprising a
concave portion; and a stator sleeve disposed in the concave
portion of the stator seat in a close fit manner, wherein the
stator hole is formed at a center of the stator sleeve.
4. The low-abrasion rotating structure as claimed in claim 1,
wherein the stator set comprises: a first stator assembly
comprising: a first stator seat comprising a concave portion; and a
first stator sleeve disposed in the concave portion of the first
stator seat in a close fit manner, wherein the stator hole is
formed at a center of the first stator sleeve; a second stator
assembly comprising: a second stator seat comprising a concave
portion; and a second stator sleeve disposed in the concave portion
of the second stator seat in a close fit manner, wherein the stator
hole is formed at a center of the second stator sleeve; wherein the
rotor set is disposed between the first stator assembly and the
second stator assembly.
5. The low-abrasion rotating structure as claimed in claim 1,
further comprising at least one fastener at an end of the rotating
shaft to prevent the rotating shaft from separating from the rotor
hole or the stator hole.
6. The low-abrasion rotating structure as claimed in claim 5,
wherein the fastener is fixed at a bottom of the concave portion of
the stator seat.
7. The low-abrasion rotating structure as claimed in claim 5,
wherein the fastener is fixed at a bottom of the concave portion of
the rotor seat.
8. The low-abrasion rotating structure as claimed in claim 1,
wherein the rotating shaft comprises two ends with cambered
surfaces.
9. The low-abrasion rotating structure as claimed in claim 8,
further comprising at least one anti-wearing plate, disposed in the
concave portion of the rotor set or the stator set, abutting the
ends of the rotating shaft.
10. The low-abrasion rotating structure as claimed in claim 1,
further comprising a pair of annular magnetic members, facing each
other, disposed at the rotor set and the stator set respectively,
wherein the polarity of the magnetic member disposed at the rotor
set and the corresponding polarity of the magnetic member disposed
at the stator set are opposite.
11. The low-abrasion rotating structure as claimed in claim 10,
wherein each magnetic member is a permanent magnet.
12. The low-abrasion rotating structure as claimed in claim 1,
further comprising a spiral coil disposed between the rotor set and
the stator set, wherein a spiral direction of the spiral coil is
the same as a rotating direction of the rotating shaft.
13. The low-abrasion rotating structure as claimed in claim 2,
wherein the rotor sleeve comprises oil-bearing material or ceramic
material.
14. The low-abrasion rotating structure as claimed in claim 3,
wherein the stator sleeve comprises oil-bearing material or ceramic
material.
15. The low-abrasion rotating structure as claimed in claim 4,
wherein the first stator sleeve comprises oil-bearing material or
ceramic material.
16. The low-abrasion rotating structure as claimed in claim 4,
wherein the second stator sleeve comprises oil-bearing material or
ceramic material.
17. The low-abrasion rotating structure as claimed in claim 1,
wherein the low-abrasion rotating structure is applied to a
motor.
18. The low-abrasion rotating structure as claimed in claim 17,
wherein the motor comprises a power generation device with a pair
of silicon steel sheets and an electromagnet.
Description
BACKGROUND
[0001] The invention relates to a rotating structure, and in
particular, to a low-abrasion rotating structure.
[0002] A motor can be applied to a heat-dissipation fan in a
computer or a compressor in an air conditioner. During rotation,
the quality of the motor depends on a rotating structure thereof.
Efficient rotating structure can prolong the life of the motor and
decrease the noise of the motor.
[0003] FIG. 1 shows a conventional rotating structure 1 comprising
a bearing support 11, a bearing 12, a rotating shaft 13, and a
fastener 14. The bearing support 11 comprises a round hole or
concave portion. The bearing 12 comprises a hole 121, and is
disposed in the round hole or the concave portion of the bearing
support 11 in a close fit manner. The rotating shaft 13 is
rotatably disposed in the hole 121. The fastener 14 is fastened at
one end of the rotating shaft 13 to prevent the rotating shaft 13
from separating from the bearing 12. The bearing 12 may be
oil-bearing material to provide better lubricity or ceramic
material to provide better abrasion resistance. The oil-bearing
material may be self-lubricating material sintered by copper-based,
iron-based, or copper iron-based powders that have been dipped in
oil. The ceramic material comprises AlO, ZrO, or SiN.
[0004] When the rotating structure 1 rotates at high speeds, both
ends, contacting the rotating shaft 13, of the bearing 12 are
easily worn. If the bearing 12 is oil-bearing material with better
lubricity, abrasion resistance is lowered so that the powder is
easily mixed with the lubricant. Thus, the lubricant deteriorates,
shortening the life of the bearing. On the contrary, if the bearing
12 is ceramic material with better abrasion resistance, its
lubricity is lowered, thus increasing noise produced thereby.
[0005] Additionally, in the above rotating structure, large amounts
of lubricant cannot be maintained since a gap between the bearing
12 and the rotating shaft 13 is extremely small. That is, only
small amounts of lubricant can be maintained in a shallow groove on
the inner wall of the hole 121, with excess lubricant leaking
out.
[0006] Thus, it is desirable for a rotating structure to improve
abrasive resistance without increasing noise.
SUMMARY
[0007] In view of this, an embodiment of the invention provides a
low-abrasion rotating structure that can improve the abrasive
resistance of the bearing to prolong the life of the rotating
structure.
[0008] The above embodiment of the invention provides a
low-abrasion rotating structure that can reduce noise during
rotation.
[0009] Furthermore, the above embodiment of the invention provides
a low-abrasion rotating structure that can maintain large amounts
of lubricant between a stator set and a rotor set to prevent the
lubricant from leaking.
[0010] Accordingly, an embodiment of the invention provides a
low-abrasion rotating structure comprising a stator set, a rotor
set, and a rotating shaft. A stator hole is defined at a center of
the stator set. A rotor hole is defined at a center of the rotor
set. The rotating shaft is disposed in both the stator hole and the
rotor hole to connect the stator set and the rotor set, and is
rotatable in respect to each of the stator set and the rotor set.
The low-abrasion rotating structure further comprises a spiral coil
disposed between the rotor set and the stator set. A spiral
direction of the spiral coil is the same as a rotating direction of
the rotating shaft.
[0011] In the low-abrasion rotating structure of the embodiment of
the invention, more than two rotatable elements are disposed
between the stator set and the rotor set. Thus, the abrasion of the
stator set and the rotor set due to the rotating shaft is largely
reduced. Furthermore, since the relative speed of the rotating
shaft with respect to the stator set and the rotor set is reduced,
the noise of the rotating structure is reduced during rotation.
Additionally, since the spiral direction of the spiral coil is the
same as the rotating direction of the rotating shaft, the lubricant
flows into a concave portion of the stator set along the spiral
direction of the spiral coil during rotation, thus preventing the
lubricant from leakage.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012] The present invention can be more fully understood by
reading the subsequent detailed description and examples with
references made to the accompanying drawings, wherein:
[0013] FIG. 1 is a schematic view of a conventional rotating
structure;
[0014] FIG. 2 is a schematic view of a low-abrasion rotating
structure as disclosed in an embodiment of the invention;
[0015] FIG. 3 is a schematic view of a rotor set and a spiral coil
in FIG. 2; and
[0016] FIG. 4 is a schematic view of a low-abrasion rotating
structure as disclosed in another embodiment of the invention.
DETAILED DESCRIPTION
[0017] FIG. 2 shows a low-abrasion rotating structure 2 as
disclosed in an embodiment of the invention. The rotating structure
2 comprises a stator set 21, a rotor set 22, and a rotating shaft
23. The stator set 21 comprises a stator seat 211 and a stator
sleeve 212. The stator seat 211 comprises a concave portion
receiving the stator sleeve 212. The stator sleeve 212 is disposed
in the concave portion of the stator seat 211 in a close fit
manner. The stator sleeve 212 comprises a stator hole 2121 at its
center. The rotor set 22 comprises a rotor seat 221 and a rotor
sleeve 222. The rotor seat 221 comprises a concave portion
receiving the rotor sleeve 222. The rotor sleeve 222 is disposed in
the concave portion of the rotor seat 221 in a close fit manner.
The rotor sleeve 222 comprises a rotor hole 2221 at its center. The
rotating shaft 23 is disposed in both the stator hole 2121 and the
rotor hole 2221 to connect the stator set 21 and the rotor set 22,
and is rotatable relative to the stator set 21 and the rotor set
22. Thus, the rotor set 22 is rotatable relative to the stator set
21.
[0018] The low-abrasion rotating structure 2 further comprises two
fasteners 24 at both ends of the rotating shaft 23 to prevent the
rotating shaft 23 from separating from the rotor hole 2121 or the
stator hole 2221. Each fastener 24 is fixed at the bottom of the
concave portion of the stator seat 211 or the bottom of the concave
portion of the rotor seat 221 to avoid vibration effect of the
fasteners 24, thus enhancing stability of the rotating structure 2
during rotation. Additionally, each end of the rotating shaft 23
comprises a cumbered surface, reducing the area contacting the
bottom of the concave portion of the stator seat 211 or the rotor
seat 22, thus reducing abrasion between the rotating shaft 23 and
the stator set 21 or the rotor set 22. Moreover, an anti-wearing
plate 25 is disposed in the bottom of the concave portion of the
rotor set 22 or the stator set 21 abutting the ends of the rotating
shaft 23. Thus, abrasive resistance is enhanced, such that the
vibration from the gap generated by the abrasion is reduced.
[0019] The low-abrasion rotating structure 2 further comprises a
pair of ring-shaped magnetic members 26, facing each other,
disposed at the rotor set 22 and the stator set 21 respectively.
Note that each magnetic member 26 may be a permanent magnet. The
magnetic pole of the magnetic member 26 disposed at the rotor set
22 and the corresponding magnetic pole of the magnetic member 26
disposed at the stator set 21 are opposite, as shown in FIG. 2.
Since the magnetic members 26 attract each other due to opposite
magnetic poles, the stator set 21 and the rotor set 22 approach
each other due to the magnetic force of the magnetic members 26.
Also, since both ends of the rotating shaft 23 abut the
anti-wearing plates 25 in the stator seat 211 and the rotor seat
221 respectively, the gap between the stator set 21 and the rotor
set 22 can be properly maintained to enable free rotation. Thus,
abutment between the end of the rotating shaft 23 and the
anti-wearing plate 25 is assured so as to enhance stability of the
rotating structure during rotation. As a result, abrasion is
concentrated on the anti-wearing plate 25 to prolong the life of
the rotating shaft 23, the stator set 21, and the rotor set 22.
Additionally, since the rotating shaft 23 is rotatable in respect
to the stator set 21 and the rotor set 22, the relative speed of
the rotating shaft 23 with respect to the stator set 21 or the
rotor set 22 is reduced compared to the conventional rotating
structure in the same situation. Thus, the abrasion between the
rotating shaft 23 and the stator set 21 or the rotor set 22 is
reduced so as to prolong the life thereof.
[0020] As shown in FIG. 2, by the design of the rotating shaft 23
and the stator hole 2121 of the embodiment, the stability of the
low-abrasion rotating structure 2 can be enhanced. Thus, a larger
gap d can be maintained between the stator set 21 and the rotor set
22 so that increased amounts of lubricant can be accommodated in
the gap d. Also, the low-abrasion rotating structure 2 further
comprises a spiral coil 27 disposed in the gap d. That is, the
spiral coil 27 is disposed between the stator set 21 and the rotor
set 22. Referring to FIG. 3, a spiral direction R.sub.2 of the
spiral coil 27 is the same as a rotating direction R.sub.1 of the
rotor set 22.
[0021] FIG. 4 shows a low-abrasion rotating structure 3 as
disclosed in another embodiment of the invention. The rotating
structure 3 comprises a first stator assembly 31, a second stator
assembly 32, a rotor set 33, and a rotating shaft 23. The first
stator assembly 31 comprises a first stator seat 311 and a first
stator sleeve 312. The first stator seat 311 comprises a concave
portion receiving the first stator sleeve 312. The first stator
sleeve 312 is disposed in the concave portion of the first stator
seat 311 in a close fit manner. The second stator assembly 32
comprises a second stator seat 321 and a second stator sleeve 322.
The second stator seat 321 comprises a concave portion receiving
the second stator sleeve 322. The second stator sleeve 322 is
disposed in the concave portion of the second stator seat 321 in a
close fit manner. The first stator sleeve 312 and the second stator
sleeve 322 each comprises a stator hole 3121 and 3221 at their
respect center. Note that the first stator assembly 31 and the
second stator assembly 32 here constitute a stator set of this
embodiment. The rotor set 33 comprises a rotor seat 331 and a rotor
sleeve 332. The rotor seat 331 comprises a concave portion
receiving the rotor sleeve 332. The rotor sleeve 332 is disposed in
the concave portion of the rotor seat 331 in a close fit manner.
The rotor sleeve 332 comprises a rotor hole 3321 at its center. The
rotating shaft 23 is disposed in both the stator holes 3121, 3221
and the rotor hole 3321, such that the rotor set 33 is connected
between the first stator assembly 31 and the second stator assembly
32. Thus, the rotor set 33 is rotatable in respect to the first
stator assembly 31 and the second stator assembly 32. Additionally,
function of the fasteners 24, the anti-wearing plates 25, and the
spiral coil 27 in FIG. 4 are the same as those in FIG. 2, and their
description is thus omitted.
[0022] Note that the stator sleeve 212, the first stator sleeve
312, the second stator sleeve 322, and the rotor sleeves 222 and
332 may be made of oil-bearing material or ceramic material based
on requirements. The oil-bearing material may be sintered by
copper-based, iron-based, or copper iron-based powders that have
been dipped in the oil. The ceramic material comprises AlO, ZrO, or
SiN.
[0023] In the low-abrasion rotating structure of the embodiment of
the invention, more than two rotatable elements are disposed
between the stator set and the rotor set. Thus, abrasion of the
stator sleeve and the rotor sleeve from the rotating shaft is
largely reduced. Referring to FIG. 2, the rotating shaft 23 is
rotatable relative to the stator set 21 and the rotor set 22,
rather than having a close fit. Thus, the relationship between the
rotating shaft 23, the stator set 21, and the rotor set 22 can
assume one of three conditions as follows. If frictional force
between the stator set 21 and the rotating shaft 23 is equal to
that between the rotor set 22 and the rotating shaft 23, the
relative speed of the rotating shaft 23 with respect to the stator
set 21 is substantially equal to that of the rotating shaft 23 with
respect to the rotor set 23. If the frictional force between the
stator set 21 and the rotating shaft 23 is less than that between
the rotor set 22 and the rotating shaft 23, the relative speed of
the rotating shaft 23 with respect to the stator set 21 exceeds
that of the rotating shaft 23 with respect to the rotor set 22. If
the frictional force between the stator set 21 and the rotating
shaft 23 exceeds that between the rotor set 22 and the rotating
shaft 23, the relative speed of the rotating shaft 23 with respect
to the stator set 21 is less than that of the rotating shaft 23
with respect to the rotor set 22. Note that the relative speed of
the rotating shaft 23 with respect to the stator set 21 and the
rotor set 22 is always less than the relative speed of the rotor
set 22 with respect to the stator set 21 irrespective of
conditions.
[0024] The following description is a comparison between the
conventional rotating structure 1 in FIG. 1 and the low-abrasion
rotating structure 2 in FIG. 2. If the relative speed of the
conventional stator with respect to the rotor is 10000 turns per
second, the stator sleeve 12 in the conventional rotating structure
1 is subjected to abrasion from the rotating shaft 13 rotating in
10000 turns per second. On the contrary, in the low-abrasion
rotating structure 2 of an embodiment of the invention, if the
frictional force between the stator set 21 and the rotating shaft
23 is equal to that between the rotor set 22 and the rotating shaft
23, the relative speed of the rotating shaft 23 with respect to the
rotor set 22 is only 5000 turns per second and the relative speed
of the rotating shaft 21 with respect to the stator set 21 is only
5000 turns per second although the relative speed of the rotor set
22 with respect to the stator set 21 is still 10000 turns per
second. Thus, only the stator sleeve 21 and the rotor sleeve 22 are
subjected to abrasion from the rotating shaft 23 rotating in 5000
turns per second. As a result, the abrasion of the stator sleeve
212 and the rotor sleeve 222 can be largely reduced so as to
prolong the life of the low-abrasion rotating structure 2. Also,
since the relative speed of the rotating shaft with respect to each
of the stator set and the rotor set is reduced, the noise generated
by the rotation of the rotating structure of the embodiment of the
invention can be effectively reduced.
[0025] Additionally, in the low-abrasion rotating structure of the
embodiment of the invention, a larger gap d is formed between the
stator set and the rotor set so that larger amounts of lubricant
can be maintained in the gap d to increase lubricity. Also, since
the spiral direction R.sub.2 of the spiral coil is the same as the
rotating direction R.sub.1 of the rotor set, the lubricant flows
into the concave portion of the stator set along the spiral
direction of the spiral coil during rotation, thus preventing the
lubricant from leaking.
[0026] The low-abrasion rotating structure of the embodiment of the
invention can be applied to a motor. For example, the stator set 21
in FIG. 2 can be connected to a base of the motor, and the rotor
set 22 in FIG. 2 can be connected to an output, such as blades of a
fan, of the motor. A power generation device of the motor, such as
a combination of a pair of silicon steel sheets and an
electromagnet, can be disposed between an outer wall of the stator
set 21 and an extension end of the rotor set 22 to generate the
relative speed of the rotor set 22 with respect to the stator set
21. According to the structure of the embodiment, the motor may be
quieter during operation. Also, the life of the motor can be
prolonged due to low abrasion. As a result, the motor with the
rotating structure of the embodiment of the invention can thus be
applied to a wide range of environments and functions.
[0027] While the invention has been described by way of example and
in terms of preferred embodiment, it is to be understood that the
invention is not limited thereto. To the contrary, it is intended
to cover various modifications and similar arrangements (as would
be apparent to those skilled in the art). Therefore, the scope of
the appended claims should be accorded the broadest interpretation
so as to encompass all such modifications and similar
arrangements.
* * * * *